Visible light inactivation of bacteria and fungi by modified titanium dioxide

2007 ◽  
Vol 6 (6) ◽  
pp. 642-648 ◽  
Author(s):  
Dariusz Mitoraj ◽  
Agnieszka Jańczyk ◽  
Magdalena Strus ◽  
Horst Kisch ◽  
Grażyna Stochel ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Bacteria And Fungi ◽  
Inactivation Of Bacteria

scholarly journals Antiviral Coatings as Continuously Active Disinfectants

2021 ◽  
Author(s):  
Luisa A. Ikner ◽  
Charles P. Gerba
Keyword(s):  
Titanium Dioxide ◽  
Free Radicals ◽  
Nucleic Acids ◽  
Visible Light ◽  
Quaternary Ammonium ◽  
Uv Light ◽  
Virus Transmission ◽  
Antimicrobial Surfaces ◽  
Bacteria And Fungi ◽  
Growth Of Bacteria

Antimicrobial surfaces and coatings have been available for many decades and have largely been designed to kill or prevent the growth of bacteria and fungi. Antiviral coatings have become of particular interest more recently during the COVID-19 pandemic as they are designed to act as continuously active disinfectants. The most studied antiviral coatings have been metal-based or are comprised of silane quaternary ammonium formulations. Copper and silver interact directly with proteins and nucleic acids, and influence the production of reactive free radicals. Titanium dioxide acts as a photocatalyst in the presence of water and oxygen to produce free radicals in the presence of UV light or visible light when alloyed with copper or silver. Silane quaternary ammonium formulations can be applied to surfaces using sprays or wipes, and are particularly effective against enveloped viruses. Continuously active disinfectants offer an extra barrier against fomite-mediated transmission of respiratory and enteric viruses to reduce exposure between routine disinfection and cleaning events. To take advantage of this technology, testing methods need to be standardized and the benefits quantified in terms of reduction of virus transmission.

Visible light induced photocatalytic inactivation of bacteria by modified titanium dioxide films on organic polymers

2015 ◽  
Vol 14 (3) ◽  
pp. 514-519 ◽  
Author(s):  
Rafał Sadowski ◽  
Magdalena Strus ◽  
Marta Buchalska ◽  
Piotr B. Heczko ◽  
Wojciech Macyk
Keyword(s):  
Thin Film ◽  
Titanium Dioxide ◽  
Low Temperature ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Low Temperature Plasma ◽  
Temperature Plasma ◽  
Titanium Dioxide Films ◽  
Photocatalytic Inactivation ◽  
Inactivation Of Bacteria

A transparent polypropylene foil pre-treated with a low temperature plasma and covered with sensitized, nanocrystalline TiO2 thin film, appears to be a useful, self-sterilizing material activated upon visible light irradiation.

Removal of naphthalene from aqueous solutions by phosphorus doped-titanium dioxide coated on silica phosphoric acid under visible light

2021 ◽  
Vol 224 ◽  
pp. 187-196
Author(s):  
Bahman Banaei ◽  
Amir Hessam Hassani ◽  
Farhang Tirgir ◽  
Abdolmajid Fadaei ◽  
Seyed Mehdi Borghaei
Keyword(s):  
Titanium Dioxide ◽  
Phosphoric Acid ◽  
Aqueous Solutions ◽  
Visible Light ◽  
Doped Titanium Dioxide ◽  
Phosphorus Doped

scholarly journals In vitro evaluation of visible light-activated titanium dioxide photocatalysis for in-office dental bleaching

2019 ◽  
Vol 38 (1) ◽  
pp. 68-74 ◽  
Author(s):  
Marla CUPPINI ◽  
Vicente Castelo Branco LEITUNE ◽  
Marcela de SOUZA ◽  
Annelise Kopp ALVES ◽  
Susana Maria Werner SAMUEL ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Dental Bleaching ◽  
Titanium Dioxide Photocatalysis

scholarly journals A Modular, Self-Assembling Metallaphotocatalyst for Cross Couplings Using the Full Visible-Light Spectrum

2020 ◽  
Author(s):  
Susanne Reischauer ◽  
Volker Strauss ◽  
Bartholomäus Pieber
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Excited States ◽  
Catalyst System ◽  
Chemical Energy ◽  
Modular Approach ◽  
Nickel Catalysis ◽  
Light Spectrum ◽  
Dye Sensitized ◽  
Self Assembling

The combination of nickel- and photocatalysis has unlocked a variety of cross couplings. These protocols rely on a few photocatalysts that can only convert a small portion of visible light (<500 nm) into chemical energy. Many dyes that absorb a much broader spectrum of light are not applicable due to their short-lived excited states. Here we describe a self-assembling catalyst system that overcomes this limitation. The modular approach combines nickel catalysis with dye-sensitized titanium dioxide and can be used to catalyze various bond formations. <br>

Visible light-induced heterogeneous Meerwein–Ponndorf–Verley-type reduction of an aldehyde group over an organically modified titanium dioxide photocatalyst

2017 ◽  
Vol 53 (30) ◽  
pp. 4215-4218 ◽  
Author(s):  
Makoto Fukui ◽  
Atsuhiro Tanaka ◽  
Keiji Hashimoto ◽  
Hiroshi Kominami
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Aldehyde Group ◽  
Light Irradiation ◽  
Benzyl Alcohols ◽  
Type Reduction ◽  
Organically Modified ◽  
Titanium Dioxide Photocatalyst

An organically modified TiO2 photocatalyst chemoselectively converted benzaldehydes to the corresponding benzyl alcohols under visible light irradiation.

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